Double wall vacuum mug



FIG. 1 is a perspective view of a double wall vacuum mug showing my newdesign;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the drawing depict portions of the double wallvacuum mug that form no part of the claimed design.

CLAIM The ornamental design for a double wall vacuum mug, as shown anddescribed.